[rules-users] (no subject)

[Sandhya Sree]

Exception in thread "pool-2-thread-1" Exception executing consequence for
rule "size" in com.net: java.lang.NullPointerException
at
org.drools.runtime.rule.impl.DefaultConsequenceExceptionHandler.handleException(DefaultConsequenceExceptionHandler.java:39)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1297)
at org.drools.common.DefaultAgenda.fireNextItem(DefaultAgenda.java:1221)
at org.drools.common.DefaultAgenda.fireAllRules(DefaultAgenda.java:1456)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:710)
at
org.drools.common.AbstractWorkingMemory.fireAllRules(AbstractWorkingMemory.java:674)
at
org.drools.impl.StatefulKnowledgeSessionImpl.fireAllRules(StatefulKnowledgeSessionImpl.java:230)
at com.net.RuleExecutor.execute(RuleExecutor.java:18)
at com.net.DirectoryMonitor.run(DirectoryMonitor.java:39)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:744)
Caused by: java.lang.NullPointerException
at
com.net.Rule_size_dc2a47e2812648e69eb9581eda931496.defaultConsequence(Rule_size_dc2a47e2812648e69eb9581eda931496.java:9)
at
com.net.Rule_size_dc2a47e2812648e69eb9581eda931496DefaultConsequenceInvokerGenerated.evaluate(Unknown
Source)
at
com.net.Rule_size_dc2a47e2812648e69eb9581eda931496DefaultConsequenceInvoker.evaluate(Unknown
Source)
at org.drools.common.DefaultAgenda.fireActivation(DefaultAgenda.java:1287)


On Mon, Mar 10, 2014 at 7:08 PM, Mauricio Salatino <salaboy at gmail.com>wrote:

> Please copy the entire stack trace.. what you have copied doesn't mean
> anything besides that there is something wrong.
>
>
> On Mon, Mar 10, 2014 at 1:29 PM, Sandhya Sree <sandhyachinnaraj at gmail.com>wrote:
>
>> im getting the following error on doing that
>>
>> Exception in thread "pool-2-thread-1" Exception executing consequence for
>> rule "size" in com.net: java.lang.NullPointerException
>>
>> what might be the problem?
>>
>>
>>
>> On Mon, Mar 10, 2014 at 4:16 PM, Wolfgang Laun <wolfgang.laun at gmail.com>wrote:
>>
>>> Seeing that the list is static you can use the usual way for accessing
>>> a static class member:
>>>
>>>     Event.listOfEvent.add( ... );
>>>
>>> @Mauricio: It's not unusual to maintain a static collection (even
>>> though there may be better ways, esp. with Drools).
>>>
>>>
>>>
>>> On 10/03/2014, Mauricio Salatino <salaboy at gmail.com> wrote:
>>> > Can you please elaborate about why do you want to do that? what's the
>>> point
>>> > of having a list inside of the Event class that will contain the same
>>> > event?
>>> >
>>> > The "Then" side of the rule is pure java.. so you just do
>>> > event.getEvents().add(event);
>>> >
>>> > but I don't see the point of doing that.
>>> >
>>> > Regards
>>> >
>>> >
>>> > On Mon, Mar 10, 2014 at 10:31 AM, Sandhya Sree
>>> > <sandhyachinnaraj at gmail.com>wrote:
>>> >
>>> >> hi ,
>>> >>
>>> >> i have a class called Event which is as follows:
>>> >>
>>> >> public class Event {
>>> >>  private  String name;
>>> >>  private  File source;
>>> >>  private  Date timeStamp;
>>> >> public static List<Event> listOfEvents;
>>> >>
>>> >> public Event(String name, File source, Date timeStamp) {
>>> >>  this.name = name;
>>> >> this.source = source;
>>> >> this.timeStamp = timeStamp;
>>> >>  }
>>> >>  public String getName() {
>>> >>  return name;
>>> >> }
>>> >> public void setName(String name) {
>>> >>  this.name = name;
>>> >> }
>>> >> public File getSource() {
>>> >>  return source;
>>> >> }
>>> >> public void setSource(File source) {
>>> >>  this.source = source;
>>> >> }
>>> >> public Date getTimeStamp() {
>>> >>  return timeStamp;
>>> >> }
>>> >> public void setTimeStamp(Date timeStamp) {
>>> >>  this.timeStamp = timeStamp;
>>> >> }
>>> >>
>>> >>
>>> >>  public void display()
>>> >>  {
>>> >>  System.out.println(name +" " + "in folder: " + source + " on " +
>>> >> timeStamp );
>>> >>   }
>>> >>
>>> >>
>>> >>
>>> >> there are also some other classes associated with my project.. i have
>>> a
>>> >> rules file which computes the size of a folder and creates an object
>>> of
>>> >> Event class. every time this object of Event class is created i wwant
>>> to
>>> >> put it in a List<Event>.. how can i do this..
>>> >>
>>> >> my rules is as follows:
>>> >>
>>> >> rule "size"
>>> >> when
>>> >>   $p:  RuleContext($size:
>>> getOldContext().getParent().getUsableSpace() >
>>> >> (30*1024*1024))
>>> >>
>>> >> then
>>> >>    Event event = new Event("folder almost full",
>>> >> $p.getOldContext().getParent(), new Date());
>>> >>    event.display();
>>> >>    ......here i want to put this event into the List<Event> declared
>>> in
>>> >> Event Class.....
>>> >>
>>> >>   end
>>> >>
>>> >>
>>> >>
>>> >> thanks,
>>> >> Sandhya
>>> >>
>>> >> _______________________________________________
>>> >> rules-users mailing list
>>> >> rules-users at lists.jboss.org
>>> >> https://lists.jboss.org/mailman/listinfo/rules-users
>>> >>
>>> >
>>> >
>>> >
>>> > --
>>> >  - MyJourney @ http://salaboy.com <http://salaboy.wordpress.com>
>>> >  - Co-Founder @ http://www.jugargentina.org
>>> >  - Co-Founder @ http://www.jbug.com.ar
>>> >
>>> >  - Salatino "Salaboy" Mauricio -
>>> >
>>> _______________________________________________
>>> rules-users mailing list
>>> rules-users at lists.jboss.org
>>> https://lists.jboss.org/mailman/listinfo/rules-users
>>>
>>
>>
>> _______________________________________________
>> rules-users mailing list
>> rules-users at lists.jboss.org
>> https://lists.jboss.org/mailman/listinfo/rules-users
>>
>
>
>
> --
>  - MyJourney @ http://salaboy.com <http://salaboy.wordpress.com>
>  - Co-Founder @ http://www.jugargentina.org
>  - Co-Founder @ http://www.jbug.com.ar
>
>  - Salatino "Salaboy" Mauricio -
>
> _______________________________________________
> rules-users mailing list
> rules-users at lists.jboss.org
> https://lists.jboss.org/mailman/listinfo/rules-users
>
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